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Method and Apparatus for Coherence Observation by Interference Noise
The present invention relates to a method and apparatus for performing interference measurements by observation of interference noise. Interference is a well-documented phenomenon in physical optics and interferometry, based on interference, has many practical applications such as the precise measurement or comparison of wavelengths. While conventional interferometry is extremely accurate and sensitive, it is very sensitivite to the stability (or rather, the lack thereof) of the relative phases of the two beams which imposes on any interferometric apparatus demands of rigidity and general mechanical perfection. The object of the present invention is to provide an interferometric method and apparatus that, while not less accurate and versatile than the conventional methods, is not affected by mechanical imperfections, and does not require a high degree of relative phase stability. This is achieved by providing a method for performing interference measurements by observation of interference noise, comprising the steps of splitting an energy beam from an energy source into two beams directed into two different arms of an interferometer; using variable delay-generating means to introduce a path difference between said two arms; introducing a variable phase difference between said two arms, and recombining said two energy beams into a single beam. The invention further provides an apparatus for performing interference measurements by observation of interference noise.present relates apparatus performing interference measurements observation noise generally Coherence Observation Interference Noise (COIN) further light source autocorrelation spectra well-documented phenomenon physical optics interferometry based practical applications precise comparison wavelengths small distances translation thicknesses detection disturbances inhomogeneities optical media determination refractive indices materials

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